$Id$ [May 1 2017] Defines an iCalendar PARTICIPANT component.

 Component name:  PARTICIPANT

 Purpose:  This component provides information about a participant in
 an event or task.

 Conformance:  This component can be specified multiple times in a
 "VEVENT", "VTODO", "VJOURNAL" or "VFREEBUSY" calendar component.

 Description:  This component provides information about a participant
 in a calendar component.  A participant may be an attendee in a
 scheduling sense and the ATTENDEE property may be specified in
 addition.  Participants can be individuals or organizations, for
 example a soccer team, the spectators or the musicians.

 STRUCTURED-DATA properties if present may refer to definitions of
 the participant - such as a vCard.

 The CALENDAR-ADDRESS property if present will provide a cal-
 address.  If an ATTENDEE property has the same value the
 participant is considered schedulable.  The PARTICIPANT component
 can be used to contain additional meta-data related to the
 attendee.

 Format Definition:

 This property is defined by the following notation:


 participantc = "BEGIN" ":" "PARTICIPANT" CRLF
( partprop / locationc / resourcec )
                "END" ":" "PARTICIPANT" CRLF

 partprop     = ; the elements herein may appear in any order,
                ; and the order is not significant.

                uid
                participanttype

                (calendaraddress)
                (created)
                (description)
                (dtstamp)
                (geo)
                (last-mod)
                (priority)
                (seq)
                (status)
                (summary)
                (url)

attach
categories
comment
contact
location
rstatus
related
resources
strucloc
strucres
styleddescription
sdataprop
iana-prop

 Note:  When the PRIORITY is supplied it defines the ordering of
 PARTICIPANT components with the same value for the TYPE parameter.